Relief shown by shading. Shows area south of Frederick, Maryland to Colchester, Virginia and west of Baltimore, Maryland to Harpers Ferry, West Virginia, including fortifications at Munson Hill. Note on verso obscured by mounting: From Capt. James W. Abert, U.S. Army Topog. Engrs. LC copy annotated in ink: Capt. James W. Abert, Capt. U.S. Army Topog. Engrs. Title, date, and scale from Stephenson's Civil ...